pg_lo_seek

pg_lo_seek

Seeks position within a large object

bool **pg_lo_seek** PgSql\Lob $lob int $offset int $whence

seeks a position within an  instance.

pg_lo_seek``PgSql\Lob

To use the large object interface, it is necessary to enclose it within a transaction block.

lob``offsetThe number of bytes to seek.

whence One of the constants (seek from object start), (seek from current position) or (seek from object end) . PGSQL_SEEK_SET``PGSQL_SEEK_CUR``PGSQL_SEEK_END

return.success

Voorbeeld: example

<?php
   $doc_oid = 189762345;
   $database = pg_connect("dbname=jacarta");
   pg_query($database, "begin");
   $handle = pg_lo_open($database, $doc_oid, "r");
   // Skip first 50000 bytes
   pg_lo_seek($handle, 50000, PGSQL_SEEK_SET);
   // Read the next 10000 bytes
   $data = pg_lo_read($handle, 10000);
   pg_query($database, "commit");
   echo $data;
?>

pg_lo_tell